NL8400275A - DEVICE FOR DEMODULATING A DRIVER SIGNAL. - Google Patents

Description

^

Device for demodulating a driver signal.

The invention generally relates to a device for demodulating a driver signal, and more particularly to a device for demodulating a driver signal which demodulates a driver signal from a signal played from a rotary recording medium in a playback device and transmits this demodulated driver signal to an external device, such as a computer having a discriminating function, and also decodes control commands received from the external device and controls the operation of the playback device based on the decoded control commands. The revolving recording medium has been described with a video signal along with an audio signal which has been time-division multiplexed with the driver signal of the external device, or together with the driver signal which is recorded independently of the audio signal.

Attempts have already been made to more effectively utilize information signals recorded on a revolving recording medium (hereinafter referred to simply as a record). These attempts include connecting a disc playback device to an external device, such as a personal computer having a discriminating function, and controlling the disc playback device 25 by means of the personal computer. For example, the personal computer may be connected to a playback device intended to play an image plate in which a video signal and audio signals are recorded in a spiral track or in concentric tracks on the record as variations in the shape of the record. In this case, it becomes possible to play the video disc in the so-called interactive mode and this feature makes it possible to use the video disc in various applications including the recording of lesson programs and the recording of games. In addition, it is 8400275 - 2 - y η.

when a personal computer is connected to a playback device intended for playing an audio record, may display an image related to a played sound and generated in the personal computer at the same time as playing the audio signals from the audio record to provide the reproduced sound. In this case, the image generated simultaneously with the delivery of the played sound makes it more interesting and enjoyable for the listener to play the audio-10 record.

In order to control the record player by means of the personal computer and to generate in the personal computer a data related to the signal being played from the record, it is of course necessary to enter a driver in the personal computer. This driver must be written in a predetermined program language that is in accordance with an interpreter of the personal computer being used, or in accordance with an image display device or the like. "It was therefore necessary a certain number of drivers in accordance with the information content. or type of plate. Furthermore, it was only possible to play a record for which drivers written in predetermined languages used in the personal computers that are used are provided, even with respect to the same type of record.

In addition, since the video disc does not contain the driver 8400275-3, the driver had to be saved independently by the user. Thus, as the number of video platet types held by the user increased, a corresponding number of drivers had to be kept separately by the 5 user. So the problem arose of the increasing use of space for storing the large number of drivers. Moreover, when controlling the video disc playback device by the personal computer according to the known method, there was only a one-way traffic path 10 between the personal computer and the video disc playback device. In other words, the information from the personal computer was simply supplied to the video disc playback device, and it was impossible to detect the state of the video disc playback device 15 by means of the personal computer.

On the other hand, there is a kind of audio record on which the driver is recorded, for example on an inward edge portion thereof. However, with such an audio record, the recording capacity for audio signals becomes small, because the signal proposed by the driver is recorded in tracks other than the tracks in which the audio signals are recorded. Furthermore, a desired operation operation could not be performed until after the entire driver had been entered into the personal computer. Thus, in order to simultaneously enjoy the image generated in the personal computer and the playback sound obtained by playing back the audio signals from the audio record, it was necessary to wait a certain amount of time for the playback of the captured driver from the audio disc 30 and inputting the played driver into the personal computer. This was a drawback because it became impossible to immediately start playing the audio signals. In addition, the memory capacity of the personal computer had to be large because the personal computer had to save the entire recorded driver at one time. In addition, the personal computer controlled the audio record playback. device and there was no control in the interactive mode.

Also, there was a game device designed to play a so-called adventure game using the personal computer and a slack that served as an external memory device. However, such a game device could only display animated strip-type images. Furthermore, it required a memory capacity of the order of 4 kbytes to obtain one still image. Thus, if a slack record of the compact type having only one playing side was used to give an example, only forty still pictures of such a compact slack record could be played. In addition to the video signal associated with the still image, it was necessary to save the driver described above.

Thus, it is a general object of the invention to provide a new and useful device for demodulating a driver signal in which the above described problems are eliminated.

A second and more specific object of the invention is to provide a device for demodulating / a driver signal which demodulates a driver signal from a signal played from a spinning recording medium in a playback device, temporarily stores the demodulated driver signal in a memory means, and then passes the stored demodulated driver signal through a selector and an interface means 30 and supplies this demodulated driver signal to an external device, such as a computer which has a discriminating function and is connected to the playback device.

The driver signal demodulating device according to the invention also decodes control commands received from the external device by a command 8400275-5 analyzer, and generates signals to control the operations of the playback device or signals the transmission of requests with regard to the memory and selector. The driver signal includes control commands 5 from the playback device that plays the revolving recording medium, and input and output commands and internal processing commands from the external device. The spinning recording medium is described with the driver signal together with at least one video signal.

In the device according to the invention, at least the recorded video signal can be played from the revolving recording medium and at the same time the driver signal can be played from the same track and then processed. It is thus possible to perform the playback 15 in a so-called interactive manner in which the interaction takes place between the external device having the discriminating function and the playback device playing the revolving recording medium.

Yet another object of the invention is to provide a driver signal demodulation device which is part of a player that plays recorded signals from a rotary recording medium by means of a recording playback element and which forms a record player together with the player . The revolving recording medium is described with a video signal and with a modulated signal that has been time-division multiplexed with an audio signal or recorded independently in place of the audio signal, in a spiral track of the revolving recording medium synchronously with the horizontal sync signal in the video signal. The modulated signal is obtained by modulating a driver signal based on a reference clock signal with a period that is an integer multiple of the horizontal scanning period of the video signal, and then limiting the band to the band of the audio signal. In the device according to the invention, it is possible to perform playback in an so-called interactive manner between the disc playback device and an external device having a discriminating function, by the disc playback device on the external-5. ne connect device. In addition, it is possible to demodulate the driver signal by using the played horizontal sync signal. Thus, it is not necessary to provide a circuit for playing the clock signal and thus the circuit structure can be simplified.

A further object of the invention is to provide a driver signal demodulation device which can demodulate a driver signal in terms of blocks all having a fixed length of approximately one field.

In the device according to the invention it is possible to force a recording-playback element (for instance a playback needle) to shift from one track to another at a location on the rotating recording medium where the driver signal is not recorded, during a special recording. -20 play modes of a playback device that plays the spinning recording medium. Hence, the driver signal can be demodulated in complete form and the driver can be decoded by a circuit that has a simple construction compared to a case where the data in the driver signal has variable lengths.

Another object of the invention is to provide a driver signal demodulation device in which, from the control commands received from an external device having a discriminating function, a control command to be executed is previously stored, so that a playback device containing a rotary recording medium , performs a predetermined operation when an address signal played from the revolving recording medium coincides with a preset value. Thus, in the device according to the invention, the time S4 0 0 2 7 5 - 7 - difference counted from the time when the driver signal is played from the rotating recording medium, until the time that the predetermined operation is actually performed in the playback device, 5 are made small.

Yet another object of the invention is to provide a driver signal demodulation device that demodulates and decodes a driver written in a middle level / with a predetermined format 10 other than the format of the language used in the external device that has a discriminatory function, and which medium-level language is essentially written in direct statements. In the device according to the invention, it is not necessary to input the entire driver in the external device by playing the driver signal once from a spinning recording medium before starting the actual playback of the main information signal of the spinning recording medium. means that it is possible to reproduce the main information immediately. For this reason, the memory capacity of the external device may be low compared to the case that the entire driver must be entered into the external device at one time before starting the actual playback of the main information signal. In addition, it is possible to play a revolving recording medium in which a driver is written written in a predetermined type of language by manufacturing only one type of plate language interpreter according to the language of the external device that is is used at the time of play-30. It is therefore not necessary to distinguish whether the language of the driver recorded on the spinning recording medium to be played is in accordance with the language used in the external device.

Other objects and further features of the invention will become apparent from the following description in particular when read in conjunction with the accompanying 3400275 V-8 drawings.

Fig. 1 generally shows an embodiment of a method for setting up a driver to be played and demodulated in a driver signal demodulation device according to the invention; FIG. 2 shows an example of the arrangement of the data in a method of producing a driver signal; Fig. 3 shows an example of the setup of an essential part of the data shown in Fig. 2; FIG. 4 shows examples of values of data bits, an error correcting code and a parity bit in the essential data portion shown in FIG. 3; Fig. 5 shows another example of the arrangement of the data in the process of establishing the driver signal; Fig. 6A and Fig. 6B are diagrams for explaining a rearrangement of data; Fig. 7 shows an exemplary embodiment of the design of the driver signal of a minimum block unit and a transmission period thereof; FIG. 8 is a systematic block diagram showing an exemplary embodiment of a signal recording system 25 for recording signals on a rotary recording medium; FIG. 9 (A) through FIG. 9 (D) are timing diagrams to explain the operation of an essential portion of the block diagram drawn in FIG. 8; Fig. 10 (A) through Fig. 10 (D) are time sequence diagrams, respectively, to illustrate the operations of another essential part of the block diagram shown in Fig. 8; Fig. 11 shows the placement of a bit in a Track Number address signal indicating whether the driver 8400275-9 signal has been recorded; Fig. 12 is a graphical representation illustrating the frequency spectrum of the signals recorded in the revolving recording medium; Fig. 13 shows an example of a general track pattern on the rotating recording medium; Fig. 14 shows an example of a connection back and forth between a record player playing the revolving recording medium and external devices 10 externally connected to the record player; Fig. 15 is a general plan view showing an example of the record player; FIG. 16 is a systematic block diagram showing an example of a portion of an existing signal playback system in the record player; FIG. 17 is a systematic block diagram showing an exemplary embodiment of a driver signal demodulation device according to the invention; Fig. 18 is a systematic block diagram showing an example of a personal computer connected to the device according to the invention; FIG. 19 is a systematic circuit diagram showing an exemplary embodiment of an essential part of the block diagram presented in FIG. 17; FIG. 20A and FIG. 20B are systematic block diagrams, respectively, illustrating another essential part of the block diagram presented in FIG. 17; FIG. 21 is a flow chart for explaining the operations of a microprocessor in case a decoder shown in FIG. 17 consists of the microprocessor; FIG. 22 is a circuit diagram illustrating an example of the decoder shown in FIG. 17 in case the decoder is composed of a digital circuit; FIG. 23 is a diagram for explaining 35 inputs to and outputs from pins located at 8400275 V? "✓ - 10 - are located at an essential portion of an RS232C interface circuit; FIG. 24A, FIG. 24B, FIG. 24C and FIG. 24D are respective flow charts for explaining the operations of a job analyzer in the block diagram shown in Fig. 17, and Fig. 25 is a diagram for explaining an example of the information content recorded on the record, the recorded position of the driver signal and the content of the driver.

In Fig. 1, an image based on a scenario 11 is recorded by means of a television camera 12. A video signal generated from the television camera 12 is processed and then recorded on a magnetic tape by means of a video tape recorder VTR. 13 On the other hand, for example, a voice reading the scenario 11 is recorded by a microphone 14. An audio signal produced from the microphone 14 is processed and then recorded on a magnetic tape in one-tape recorder 15. Furthermore, a driver 16 based on the scenario 11 is basically written in direct commands (statements) using a high-level language, independent of the creation of the video and audio signals. In addition, a connection program is created.

25 In manufacturing the driver 16, addressing jump instructions is performed by labels and page coordinate instructions (location instructions and writing pen instructions to name some examples) are described in percent for the X and Y coordinates. This measure 30 is taken because the size of the screen of the personal computers or the like is different according to the model. By taking this measure, the image is displayed practically in the intended location on the screen regardless of the model of the personal computer.

35 The driver 16 is translated into a language 8 4 0 0 2 7 5 - 11 - at the middle level in an editor -and-translator 17. Then a simulation is performed based on the driver translated into the language at the middle level, and a detection is performed in a simulator and error repairer 18.

5 When the simulator and error repairer 18 detects an error in the driver, the driver 16 set in the high level language is changed. The modified driver is then passed through the editor and translator 17 and the simulation and error repair are performed in the simulator and error repairer 18. The driver written in the middle level language is set up in this manner. The driver in the mid-level language is further modified by considering the time interval between labels (the interval between scenes to be inserted), as well as the order of the labels with reference to a label table 19 8400275 c - 12 - and by considering the placement of subroutine commands. Finally, a driver 20 is created by inserting the driver at predetermined time positions into the video and audio signals to be displayed.

On the other hand, the video signal played in the VTR 13, and the audio signal played in the tape recorder 15 are subjected to a predetermined signal processing which will be described hereinafter. In addition to being subjected to the predetermined signal processing, an address signal indicating the track number, time code (time address) and the like is added to the video and audio signals played back. Furthermore, the original information data in the driver 20 is subjected to an operation which will be described below in a block 21.

That is, the block length of the original information data in the driver 20 is set to that of a data block unit that is a multiple of 6 bytes. For example, when the block length of the original information data is less than or equal to 6 bytes, the data block unit is set to 6 bytes (48 bits), and when the block length is greater than 6 bytes and less than or equal to 24 bytes, the data block unit is set to 24 bytes. Likewise, when the data block length is greater than 24 bytes and less than or equal to 48 bytes, the data block unit is set to 48 bytes and when the data block length is greater than 48 bytes and less than or equal to 96 bytes, the data block unit set at 96 bytes.

The driver 20 is composed of control commands and sub-commands (for example, special video effects) of a record playback device to be described hereinafter, input and output control commands from an external device, such as a personal computer , a play set or the like, which has a discriminating function and is connected to the disc playback device, 8400275-13 and internal editing commands (substitution commands, control eight commands and, random number generating commands and subroutine stacking commands, for some cite examples) of the external device. The driver 20 is funda-5 mentally written in direct commands (statements) and the block length is normally less than or equal to 6 bytes or less than or equal to 24 bytes. However, in the case of string substitutions, and data statements and control programs, such as a subroutine stack, to be recorded in an external device, the block length may exceed 48 bytes. When the data length of the original information data is shorter than the fixed data block length set, dummy data is inserted into the remaining data length.

The dummy data is inserted to perform a data arrangement which will be described below in the description.

Then, the aforementioned fixed data block length is divided into 6 bytes. A 1-byte information header is added at the beginning of each of the 6-byte data sections. Fig. 2 shows a 1-byte header HE added at the beginning of a 6-byte information data D0 through D5.

Then, all seven bytes from the HE head to the information data D0 to D5 are divided into four upper bits and four lower bits. A 3-bit error-correcting code and a 1-bit parity bit are then added to the information 25 containing four upper bits associated with the information data in one of said seven bytes each. Likewise, a 3-bit error-correcting code and a 1-bit parity bit are then added to the information-containing four lower bits associated with the information data in one of said seven bytes each. Fig. 3 shows the data composed of four information-containing upper or lower bits b ^ to b ^, the 3-bit error correcting code b5 to b7, and the 1-bit parity bit b8.

For example, the values of bits b1 through b8 represented in Fig. 3 are selected as given in 8400275 * 14 as in Fig. 4. Thus, the information data in all seven bytes shown in Fig. 2, four control bits b5 through b8 are added to both the four information-containing upper bits and to the four information-containing lower bits thereof, as indicated in Fig. 3. As a result, Fig. 2, 14-byte block represented in Fig. 2, as shown in Fig. 5. In Fig. 5, the four upper bits and the four lower bits of the head signal HE shown in Fig. 2 are respectively thaw; HE and HE. Likewise, a

U L

Index ü at the information data D0 through D5 represents the four information-containing upper bits of the information data D0 through D5 represented in Fig. 2 and represents an index L at the information, data D0 through D D5 is the four information-containing lower bits of the information data D0 through D5 represented in Figure 2. Furthermore, in Figure 5, the four control bits composed of the error correcting code and the parity bit are represented by HA. The 4-bit control word HA detects the error in the 4-bit information data immediately preceding it and corrects the error.

Subsequently, the data in the 14 bytes represented in Fig. 5 are rearranged (so-called shaking or mixing) in order to minimize the effects of a shock foil at the time of reproduction. The 14-byte data shown in Fig. 5 is divided into 25 1-byte. Assuming that the data is numbered in all bytes obtained by the division as indicated in Fig. 6A, this data is re-arranged as indicated in Fig. 6B. After this rearrangement of data, a 1-byte framing code is added to the beginning of the rearranged 14-byte data to indicate the beginning of the rearranged 14-byte data. A transmission period in which a single bit of a 15-byte driver program signal composed of the 1-byte framing code and the rearranged 14-bytes of data is set to 2H, where H represents one horizontal line period. Further, as shown in FIG. 7, in which case the recorded video signal is @ 400275. In the NTSC system, the aforementioned 15-byte driver program signal provided over a period of 250H from a scan line number 21H to a scan line number 260H (a scan line number 284H to a scan line number 523H).

In addition, the 15-byte driver signal is modally modulated by a self-clocking modulation system and is time-division multiplexed with the audio signal, for example, and this time-division stacked signal is recorded in a plate 10 23 by means of a cutting device drawn in fig. 1.

The original driver information data is therefore divided into 6 bytes and then formed into the 15-byte driver signal containing the 1-byte framing code as described above in connection with Figures 2 to 7. 7-byte driver signal shown in FIG. 7 is recorded for the duration of about one field, but the 15-byte driver signal is not transmitted during the intervals G1 and G2 which together last 22.5H. These intervals G1 and G2 are provided so that the 20 15-byte driver signal can be played positively even when a special image is output and a record player of a video disc player to be described later in the description is forced from one track turn to a others to slide in the vicinity of scan line number 11H which falls in the vertical blanking time. In addition, when the original commands in the driver are 6 bytes or less, the same 15-byte driver signal can be repeatedly captured in a single track of the record 23 (e.g., repeated four times 30 in a single track). In this case, it becomes possible to play the driver signal even if the recording playback element is forcefully shifted from one track layout to another at any location of the one track layout.

35 8 400 275 - 16 -

In FIG. 8, a driver generator 25 generates the driver signal generated by the method described above in connection with FIGS. 1 to 7, in a time format shown in FIG. 7. For example, a color video signal in the NTSC system is obtained from a color video signal source 26. Furthermore, a first channel audio signal is obtained from an audio signal source 27 and a second channel audio signal is obtained from an audio signal source 28. The driver signal being output generated from the driver signal generator 25 is a non-zero return signal (NRZ signal) which is not suitable for recording and playback in the form in which it is located. Thus, the driver signal is modulated into a signal as shown in Fig. 9 (C) by means of a self-clocking modulation system, such as a frequency modulation (FM), a two-phase working sign modulation, and a two-phase quiescent sign modulation.

A horizontal synchronizing signal f ^ as shown in Fig. 9 (A) is applied to a modulator 29 20 from a synchronizing signal isolation circuit 37. The modulator 29 divides the frequency f of the horizontal synchronous

H

signal by two and subjects the driver signal to a biphasic work modulation using the horizontal sync signal whose frequency is divided as a reference clock signal. As shown in fig.

9 (C), the modulated signal reverses its state with a period 1H when the data in the NRZ signal represents a "1", otherwise it reverses its state with a period 2H, namely when the data in the NRZ signal represents represents a "0" -30. Compared to the NRZ signal, this modulated signal contains less DC current and more clock signal and is therefore suitable for recording and playback. The modulated signal is band-limited to the audio signal band and is delayed approximately 1 H in a low-pass filter 30. An output 8400275 ·· .. '·. ill · · ........

Thus, van -: - 17 - of the low-pass filter 30 is practically sine-shaped as shown in Fig. 9 (D). As is clear from Figures 9 (A) and 9 (D), the phase of the peak values in the output signal of the low-pass filter 30 practically corresponds to the phase of the horizontal synchronization signal

Thus, in the disc playback device to be described later in the description, the data can be demodulated using the played horizontal sync signal

f and it is not necessary to use the clock signal component from the mododu-H

10 learned to reproduce signal.

The control signal whose band is limited and which is delayed in the low-pass filter 30 is supplied to a switching circuit 31. The switching circuit 31 is arranged to selectively pass the control signal. For a period of time during which the control program signal is not generated, the switching circuit 31 selectively passes the second channel audio signal from the audio signal source 28. Thus, the driver signal or the second channel audio signal 20 is also obtained from the switching circuit 31. A time division multiplexed signal containing the driver signal and the second channel audio signal is applied from the switching circuit 31 to a frequency modulator 33. A frequency modulated signal f, for example, in a band of 3.73 MHz ± 75 kHz, which is frequency modulated by means of the time division multiplexed signal mentioned above, is supplied to a mixer 43 from frequency modulator 33. On the other hand, from frequency modulator 32, a frequency modulated signal f , for example, in a band 30 of 3.43 MHz ± 75 kHz, which is frequency modulated by means of

From the first channel audio signal applied to the mixer 43.

The NTSC system color video signal from the color video signal source 26 is supplied -35 to comb filters 34 and 35. The comb filter 34 performs a comb filter 8400275 e 'ii - 18 - operation in a band of more than 2 MHz to produce a color bring carrier signal into band-part multiplex which is converted to a low-frequency range of 2.56 MHz. A description of the color carrier signal that is converted to the low-frequency range will be given hereinafter in the description. A brightness signal that is isolated in the comb fliter 34 is applied to a low-pass filter 36. The low-pass filter 36 sets the upper cutoff frequency of the brightness signal at about 3 MHz. In addition, a color carrier signal in a band of 3.58 MHz ± 500 kHz is obtained from the comb filter 35 and supplied to a color subcarrier generator 38 and to a color signal conversion circuit 39. The color subcarrier generator 38 uses a known method of generating an undamped wave 15 having a frequency equal to a color subcarrier frequency f (3.579545 MHz in the case of the color video signal in the NTSC system) of the color carrier signal from a bump gate pulse and a color burst signal in the color carrier 20 signal. The impulse gate pulse is formed from the synchronization signal which is isolated from the brightness signal output from the low-pass filter 36 in the synchronization signal isolation circuit 37. On the other hand, the color signal conversion circuit 39 multiplies the frequency of the undamped wave from the color subcarrier generator 38 by 12/7. and this circuit subjects the multiplied undamped wave and the incoming color carrier signal to a beat conversion. As a result, a color carrier signal is converted to a low-frequency range and has a color carrier frequency of 5fgc / 7, from the color signal conversion chain 39.

The above-mentioned color carrier signal which is converted to the low-frequency range is mixed with the band-limited luminance signal from the low-pass filter 36 in a mixing stage 40. A band-division multi-8400275% - ♦ * - 19 - Plex-impeded output from the mixer 40 is subjected to an appropriate pre-emphasis in a pre-era base circuit 41 and the thus processed signal is applied to the mixer 43.

The undamped wave with the color sub-carrier frequency f obtained from the color sub-carrier generator eg 38 is supplied to a reference signal generator circuit 46 together with the synchronization signal which is isolated in the synchronization signal isolation circuit 37. The reference signal generator generator 46 generates a burst first reference signal fpl having the frequency fsc / 5 over four fields which is equal to one track of an original record plate, and generates a bump second reference signal fp2 which has a frequency fg ^ / 7 has 15 over the next four fields. The reference signal generator circuit 46 repeats an operation in which the first and the second reference signals fp1, fp2, respectively, are alternately generated via an output terminal 48. Furthermore, the reference signal generator circuit 46 also generates a third reference-20 signal having, for example, a frequency fsc / 13. in accordance with the point where the first and the second reference signals fpl and fp2 transition, respectively. The reference signal generator circuit 46 generates the third reference signal fp3 for a time of about 3H and applies this third reference signal fp3 to a mixer 45. FIG. 10 (A) shows the vertical sync signal and the horizontal sync signal in the vicinity of the vertical blanking period separated from the video signal to be recorded. As shown in Fig. 10 (C), the third reference signal fp3 is generated substantially in accordance with the vertical synchronizing signal. In addition, the first and second reference signals fp1 and fp2 are generated with a period 1H as shown in Fig. 10 (D).

Fig. 10 (B) indicates that a chapter address-35 signal Ac, a time address signal A ^, and a track (page) 8400275 - 20 -

a

* number of address signal A ^ are respectively transferred during an interval 1H in the respective scan line nuramers 17H, 18H and 2OH. In the case of an even field, the chapter address signal A, the time address signal A and the track-5 number address signal A ^ are passed in the scan line numbers 280H, 281H and 283H, respectively. These address signals are supplied to the mixer 43 via an input terminal 42 shown in FIG. The chapter address signal Ac indicates the recording position of the signal on the plate in the series of 10 programs. The time address signal A ^ indicates the total time.

Furthermore, the track number address signal A ^ indicates the number of tracks by using the recording position of the third reference signal fp3 as a starting point and by counting a track turn when the record has made one revolution. The said address signals A ^, A ^ and A ^ are composed of 29 bits, respectively.

Fig. 11 shows an example of a signal format of the track number address signal A ^. In Fig. 11, a synchronization signal 50 of a fixed pattern and having, for example, a value "C" in hexadecimal is included in bits 1 through 4 proposed by SYNC. A line discrimination code 51 is housed in the two bits following the sync signal 50, and an audio discriminating code 52 is housed in the two bits following the line discriminating code 51. The line discriminating code 51 is used to discriminate the scan line number used to transmit the track number address signal and, for example, to take a value "01". The audio discriminating code word 52 is used to distinguish the type of the recorded audio signal (stereo, mono and bilingual, to name a few examples). A codeword designating the track number is contained in 20 bits running ciq sts from the 9 through the 28 bit position. A 1-bit parity bit 54 is set at the last bit position. The codeword, which indicates the track number, is composed of five subcode-

0 4 0 0 2 7 S

-21-.

- * words 53a through 53e each covering four bits. The 4-bit subcode words 53a through 53e shown in Fig. 11 designate the value of the 10,000 numbers, the thousands, the hundreds, the tens and the units of the track-5 number in hexadecimal notation. In the case of a record.

with which a recording of up to 60 minutes can be recorded on one side of the record, the maximum number of tracks on one side of the record is 54,000. The maximum value of the 4-bit subcode word 53a in this case is the hexadecimal "5", 10 and "5" in hexadecimal is "0101" in binary notation. Thus, the most significant bit (MSB) of the 4-bit subcode word 53a, that is, the ninth bit of the number address signal track, will always assume the value "0". The MSB of the 4-bit subcode word 53a is indicated by hatching in Figure 11.

Thus, therefore, the ninth bit of the track number address signal is used to distinguish the existence of the driver signal, that is, to determine whether the driver signal has been recorded. When the ninth bit of the track number address signal takes a value of "1", it will be assumed that the driver signal has been recorded for a duration of 240A from the scan line number 21H (284H).

The signals applied to the mixer 43 are multiplexed and a multiplexed output from the mixer 43 is frequency modulated in a frequency modulator 44 shown in FIG.

A frequency-modulated output from the frequency modulator 44 is supplied to the mixer 45. Via an output terminal 47, a mix signal containing the frequency-modulated output from the frequency modulator 44 and the third reference signal fp3 from the reference signal generator circuit 46 is supplied. , produced.

Fig. 12 shows an example of a frequency spectrum of the signal to be recorded. A band I 35 represents a 2.3 MHz carrier frequency finishing band of 8400275 Η / - 22 - the frequency-modulated luminance signal. A frequency f & represents a frequency of 6.1 MHz corresponding to the synctop, a frequency f represents a frequency of

D

6.6 MHz corresponding to the sync signal foot voltage, and a frequency f represents a frequency of 7.9 MHz corresponding to maximum white. The bands II and II represent U Xi, respectively, the upper sideband and the lower sideband of the frequency-modulated brightness signal, and bands III and II1, respectively, represent the upper sideband and lower-10 sideband of signals obtained by frequency modulation the frequency-modulated signals f and f.

riX ΆΖ »

The carriers of the frequency-modulated signals f and

A X

f which have a frequency of 3.43 MHz and 3.73 MHz, respectively, are indicated at IV in Fig. 12. As described above, the driver signal which is subject to the .5 two-phase working modulation is multiplexed with the second channel audio signal on a time division basis and this multiplexed signal frequency modulates the carrier at the frequency of 3.73 MHz to get the frequency-modulated 20 signal. Furthermore, the frequency-modulated signal f modulates a predetermined carrier. The driver signal is recorded on the original record plate with a signal format in which the driver signal is subjected to multiplexing, the frequency modulation and a second frequency modulation mentioned above in time division.

In Fig. 12, a band V represents the band of the color carrier signal converted to the low frequency band obtained from the color signal conversion circuit 39. In addition, when the color carrier signal converted to the low frequency band, in the frequency toe modulator 44, frequency modulated, first sidebands V1 and V1 and second sidebands V1 and V1 are obtained. In fig.

12, the frequency spectrum indicated by the solid line represents the frequency spectrum of the signal recorded at 8400275 <- 23 - the original recording plate.

The reference signals fpl, fp2 and fp3 are placed in an unused band below the band VII. The tape occupied by the reference signals fpl to fp3 and the tape in which the information signal is located are separated from each other because these signals are to be reproduced by the same recording playback element.

The information signal obtained from the output terminal 47 (FIG. 8), and the reference signals fp1 and fp2 obtained from the output terminal 48, are converted to a first and a second modulated laser beam in a known cutter using the laser beam. This first and second laser beam are simultaneously focused on a photosensitive agent that covers the surface of the original recording plate, in a state where the first laser beam and the second laser beam are separated from each other by a distance of about half the track distance. stand. Subsequently, the original recording plate is subjected to a known development process and a known plate making process. As a result, a plate 55 which has the function of an electrode and which has no guide slots for guiding the recording playback element and which has a track pattern as shown in FIG.

13.

The information signal from the output terminal 47 contains the video signal, the audio signal, the address signal and the driver signal. This information signal is recorded in a spiral track T on the plate 55 shown in Fig. 13 as a frequency modulated signal. The information signal 30 is recorded as a row of spaced apart pits according to the information content of the information signal.

In the only continuous spiral track T shown in FIG.

13 is indicated by a solid line, each track turn of the plate 55 is represented by t1, t2, t3, ... Each track is formed from wells of the information signal on a flat surface 8400275%. Jf s.

- 24 - from the record and no guide slot is made for guiding the recording playback element. With respect to a single track turn, pits of the first reference signal fp1 and pits of the second reference signal fp2 are -5, respectively. made either side of the track in its longitudinal direction for each horizontal scan period (1H) at locations corresponding to the horizontal blanking time.

Wells of only one of the reference signals fpl and fp2 are disposed at an intermediate location between 10 axes of adjacent track windings. In addition, with respect to a particular track winding, the sides on which the reference signals fpl and fp2 are recorded are swapped for each track winding. In other words, the tracks of the first reference signal fp1 are represented by dashed lines and the tracks of the second reference signal fp2 are represented by dashed-dot lines. Locations where the vertical sync signal is recorded in each field are represented by, V ^, V3, .... Furthermore, the third reference signal fp3 is recorded for a time 3H, as described above as an example, at the initial positions of the tracks t1, t2, t3, ____, i.e. the positions V., Ve, 1 5 V, ... where the sides on which the reference signals fpl and fp2 y are recorded are exchanged.

Moreover, a single revolution time of the plate 55 is equal to the duration of, for example, four fields of the video signal. The vertical blanking time is fixed on the track windings t1, t2, t3 ... within distances represented by a, b, c and d.

The driver captured on the disc is essentially written in direct statements. Thus, the data length of the original information data in the driver is usually no more than 6 bytes and the driver is formed into the driver signal having a number of bytes reaching up to 15, as shown in FIG.

7 indicated. This driver signal 8400275 v .....

- 25 - is recorded in a time interval of 240H. However, the second channel audio signal is recorded in the following track windings. Since the driver is sequentially recorded in a distributed manner in each of the tracks, the driver is entered into the personal computer or the like used during playback each time the record 55 is played. As a result, the memory capacity of the personal computer can be limited because there is no need to save the driver once the commands are executed in the driver.

The driver is written in a predetermined mid-level language, as described above. Thus, as will be described hereinafter, it is necessary to produce a plate language interpreter for interpreting the multilevel level language in a predetermined language that can be understood by the external device, such as the personal computer. The interaction between the disc playback device and the external device becomes possible by using such a disc language interpreter. In other words, it is necessary to produce a number of drivers according to the number of plate types, but by a number of plate language interpreters according to the total number of language types that will be used in the external to manufacture devices expected to be used is sufficient to deploy only one type of driver with respect to one type of plate. This considerably reduces the burden on the developer of the software compared to the known case described above.

Furthermore, the driver is recorded in the same track as the video signal or the like using the transmission channel of the second channel audio signal.

Thus, with regard to the first channel audio signal and the video signal, it is possible to reserve a memory capacity which is identical to the memory capacity of the known 8400275-26 plate on which no driver is recorded. That is, the record capacity of the record with respect to the first channel audio signal and the video signal is not limited.

Next, a description will be given of the driver signal modulation device according to the invention which plays and demodulates the recorded signals from the record. In FIG. 14, two-way local commands are sent between a video disc player 56 and an interface box 57 constituting the device of the invention.

The signals played from the record in the video disc player 56 are supplied to a video / audio processor 58 which is used to obtain special effects. In addition, the local commands are sent in two directions 15 between the interface box 57 and the video / audio processor 58 and between the interface box 57 and a drawing and audio generator 59. In the description given herein, a system composed of the video disc player 56, the interface box 57, the video audio processor 58 and the drawing and audio generator 59 are referred to as a disc playback device 60. It is not essential that the video / audio processor 58 and the drawing and audio generator 59 are provided. In addition, it will be assumed that the interface box 57 includes a normalized two-way interface, such as, for example, an RS232C.

In Fig. 14, various commands based on the driver reproduced from the record are sent in both directions between the interface box 57 in the record playback device 60 and an external device 61 which has a discriminating function. The external device 61 may be a device such as a personal computer and a playground device 63. In addition, video and audio signals generated from an external device 61 are respectively supplied to a television receiver via the video / audio processor 58. Furthermore, the video and S 4 0 0 2 7 5 _. Audio signals obtained in a television camera 65 by recording an image and sound, respectively, supplied to the television receiver 64 via the video / audio processor 58.

The video record player 56 includes a known signal pickup device, a known track servo circuit, and the like.

A brief description of these constituent elements of the video record player 56 will now be given. In Fig. 15, the plate 55 is placed on a turntable 66 and secured by a clamping member 67. The plate 55 is rotated in a clockwise direction with the turntable 66 at a predetermined speed. A signal pickup device 68 includes a holder 71, a coaxial resonator 72 and the like and is mounted on a carriage 73. The holder 71 includes an arm 70 with a playback needle 69 at the top. The carriage 73 includes a pair of roller wheels 74a and 74b on one side and of one roller wheel 75 on the other side. The roller wheels 74a and 74b, respectively, are provided with a groove. A projection 76 on the carriage 73 is attached to a strap 78 which is mounted over discs 77a and 77b. A drive motor 59 causes the disc 77a to rotate by means of a gear mechanism 80. When the drive motor 79 is rotated, the roller wheels 74a and 74b roll over a rail 82a mounted on a chassis 81, while the roller wheel 75 rolls over a rail 82b.

Thus, the carriage 73 is movable in the directions of the arrows Y1 and Y2.

Next, a description will be given of a signal demodulation system in the video disc player 56 with reference to Fig. 16. In Fig. 16, the parts which are the same as corresponding parts in Fig. 15 are denoted by the same reference numerals. In Fig. 16, the plate 55 is placed on a turntable rotated by a motor (not shown). The record 55 thereby undergoes a high speed synchronous rotation along with the turntable in the direction of an arrow Y. As the record 55 is rotated, the playback needle 69 slides over the surface of the record 55 C ° C 0 2 7 5 - 28 -

\ J

and scan it.

The playback needle 55 is attached to one end of the arm 70, and a permanent magnet 84 is attached to the base at the other end of the arm 70. The portion where the permanent magnet 84 of the arm 70 is attached is surrounded by a jitter compensation coil 86 and by a tracking coil 85 mounted on the video disc player 56. In the jitter compensation coil 86, a right and a left coil portion are wound with the same phase, respectively. Thus, from these 10 coil parts, an attractive force or a repulsive force on the permanent magnet 84 acts simultaneously according to the sign of a jitter compensation signal obtained via an input terminal 87. As a result, the arm 70 moves linearly along the tangent of the trace on the plate 55 and the jitter introduced due to eccentricity and irregularities or unevenness of the surface of the plate 55 is compensated. In addition, the tracking coil 85 generates a magnetic field in a direction perpendicular to the magnetic field of the permanent magnet 84 and thus causes the arm 70 to move in a direction between the directions of an arrow Z (track width direction) according to the sign of a tracking error signal which is obtained from a tracking circuit 100 over a distance corresponding to the magnitude of the tracking signal.

A recording circuit 88 includes a resonance circuit whose resonance frequency is varied in accordance with the variation of the electrostatic capacitance between an electrode of the playback needle 69 and the plate 55 due to the rows of spaced apart wells, a circuit for applying a constant frequency signal at the resonant circuit, a circuit for detecting the amplitude of the high-frequency signal obtained from the resonant chain, and a circuit for pre-amplifying the detected high-frequency signal (played signal). The high-frequency played back signal obtained from the recording circuit 88, 1400275-29 - is fed to a demodulator 89 in which the main information signal (the video signal and the audio signal in this case) is demodulated from the main track. The demodulated signal is supplied through an output terminal 93. On the other hand, a portion of the high-frequency playback signal from the recording circuit 88 is applied to bandpass filters 91 and 92 and a detector 90. The bandpass filters 91 and 92 have properties to select only the respective frequencies of the reference signals fpl and fp2, respectively, and to reinforce. The reference signals fp1 and fp2, respectively, obtained from the bandpass filters 91 and 92, are applied to a first and a second input terminal of a gate switching circuit 94. The detector 90 selects the reference signal fp3 according to the frequency and generates an envelope detection signal. The detector 90 itself generates a detection signal which is in phase with the envelope detection signal of the reference signal fp3 obtained up to that point, even when the reference signal fp3 is not played due to signal dropout and the like, and this detection signal becomes supplied to a switching pulse generator 95.

The gate switching circuit 94 is switched by a switching signal from the switching pulse generator 95. For example, during the time when the switching signal is high level, the respective output signals of the bandpass filters 91 and 92 are applied independently to the respective input terminals of detectors 97 and 98. On the other hand, during the time that the changeover signal is low level, the respective outputs of the band-pass filters 91 and 92 are independently applied to the respective input terminals of the detectors 98 and 97.

The sign of the switching signal from the switching pulse generator 95 is reversed with an incoming detection signal from the detector 90 or with a kick pulse (excluding an incoming kick pulse during playback 8400275 i - 30 - of the reference signal fp3). from a kick pulse generator 96. An envelope detection signal of a reference signal played from a track on the outside of the track to be played is thus obtained from the detector 97. In addition, an envelope detection signal of a reference signal played from a track on the inside of the track to be played is obtained from the detector 98. These envelope detection output signals from the detectors 48 and 49 are supplied, respectively. to a differential amplifier 99 present in a next stage of the system. A tracking error signal having a sign corresponding to the direction of the tracking error and having a level (strength) corresponding to the magnitude of the tracking error is obtained from the differential amplifier 99. This tracking error signal is applied to the tracking coil 85 via the tracking circuit 100 in which the tracking error signal is converted into a predetermined driving voltage for controlling the tracking coil 85. The playback needle 69 is accordingly moved 20 in the radial direction of the record 55 with the appropriate direction. and quantity so that the tracking error becomes zero, and the playback needle 69 accurately over the spiral track T on the record. 55 is running.

The main information signal demodulated in demodulator 89 is supplied to a known color video signal playback system (not shown) and a known audio signal playback system (not shown) through output terminal 93. The demodulated main information signal in these systems is converted into a reproduced color video signal 30 according to a normalized television system and a reproduced audio signal. The reproduced color video signal and the reproduced audio signal are then fed to a monitor television receiver (not shown). In addition, the output of demodulator 89 is supplied to a microprocessor 101.

»_ _ § 4 0 0 2 7 5 - 31 -

Now, there is a description of the parts of a playback system that reproduces the driver signal in the record playback device, and of all parts of a playback system that reproduces the driver signal in the external device in accordance with the operations of the playback operations. In the case where the external device 61 is the personal computer 62 having, for example, the construction as shown in Fig. 18, the plate language interpreter previously recorded in an external memory, such as a cassette tape or a floppy disk, is input to the personal computer 62. This interpreter is a utility for interpreting the statements (commands) in the driver played from the record 55, into statements (commands) in a machine language that will be understood by the personal computer 62. Regardless of the type of plate 55, it is sufficient to arrange a single type of plate language interpreter with respect to a single type of personal computer. This means that a driver played from some kind of (information content) record 55 can be decoded in the personal computer 62 by creating only a single kind of external memory in which a record language interpreter previously stored belongs to the personal computer 62. Furthermore, this means that the driver recorded on the plate 55 can be written in a single, predetermined type of mid-level language. Thus, unlike in the known case, it is not necessary to write the driver in different languages used in the different models of personal computers manufactured by different manufacturers. The plate language interpreter 30 is written in a machine language so that processing can be completed in a short time taking into account the limited processing speed of the personal computer 62.

When the operator inserts the disc 55 into the video disc player 56 shown in FIG. 17, the video disc player 56 automatically enters a playback mode. Thus, the signal pickup device 68 described above, a played signal is obtained and the played signal is fed to a signal demodulator 110 shown in FIG. 17. The signal demodulator 110 has a structure that includes the demodulator 89 shown in FIG.

The tracking error signal is applied to a tracking servo system 111 which includes the tracking coil 85 and the like shown in FIG. On the other hand, the played video signal and the played audio signal from the output terminal 93 are respectively supplied to a television monitor 113 and to a loudspeaker 114 under the control of an output controller 112. The played video and audio signals are also supplied to a driver modulator 115. The modulated signal modulated with the driver signal 15, which is applied to the driver modulator 115, and the second channel audio signal which is supplied to the output controller 112, are selectively obtained from a circuit in the signal demodulator 110. This circuit in the signal demodulator 110 is shown in FIG.

20 19.

In Fig. 19, the played signal from the output terminal 93 is applied to an input terminal 150. The signal from the input terminal 150 is supplied to a bandpass filter 151 in which the frequency-modulated signal f is selected according to its frequency, and an output signal from the band pass filter 151 is subjected to an FM detection in a detection circuit 152. The modulated signal subjected to the biphasic work modulation by the driver signal, or the second channel audio signal 30 is supplied from the detection circuit 152. This output from the detection circuit 152 is passed through a de-emphasis circuit 153 and then applied to a terminal 154a of a switching circuit 154 and to a terminal 155b of a switching circuit 155.

On the other hand, the address signals A ^, A ^ _ and A ^ become 8400275. * - 33 - which have been multiplexed in the vertical blanking time of the video signal in the played back signal obtained from the output terminal 93, separated and applied to a 29-bit shift register 157 via an input terminal 156. The af-5 played vertical sync signal is applied to an input terminal 158. This played vertical sync signal clears the shift register 157 and at the same time biases a D-type flip-flop 159 through a front of this signal. Accordingly, a 10 Q output of the flip-flop 159 assumes a high level and this high level Q output opens the gate of a NAND circuit 160. Thus, application to the shift register 157 is started as a shift pulse of the clock signal component. in the played-back address signal which is supplied to an input terminal 161, via the NEN-circuit 160 from the time at which the precedent of the played-back vertical synchronizing signal is received. Thus, the played back address signal applied to the input terminal 156 is shifted successively to the left in the shift register 157 shown in FIG.

The first bit, the second bit and the sixth bit of the shift register 157 are applied directly to a NAND chain 156. On the other hand, the third bit, the fourth bit and the fifth bit of the shift register 157 are applied to the NAND chain, respectively. 156 via inverters 162, 163 and 164.

The synchronization signals in each of the address signals A

A ^ and A ^ take a common value "C" in hexadecimal notation, respectively. However, the 2-bit line discrimination code words following the respective synchronization signals in the address signals Ac, A ^ and A ^ differ from each other. For example, the line discriminating code word 51 of the address signal An is "01". Thus, a low level detection signal is obtained from the NEN circuit 165 only when the entire 29-bit address signal A 1 is input to the shift register 157.

N

This detection signal from NAND circuit 165 is applied to .35 the respective D-type clock input terminals C

K

8400275> - 34 - flip-flops 159 and 166. A data input terminal of the flip-flop 159 is grounded. On the other hand, the ninth bit of the shift register is applied to a data input terminal of the flip-flop 166. Thus, the Q output of the flip-flop 159 assumes a low level from a point at which the aforementioned detection signal from the NAND- chain 165 is provided. This low level Q output of the flip-flop 159 is grounded on the NAND circuit 160 and closes the gate of the NAND circuit 160 so as to block the supply of the shift pulse to the shift register 157. At the same time, the data in the ninth bit of the played address signal An is output via a Q output of the flip-flop 166. This Q output of the flip-flop 166 is presented to the switching circuits 154 and 155 as a switching signal.

As described above in connection with FIG. 11, the ninth bit of the address signal AN contains the discriminating signal indicating the existence of the driver signal. When the ninth bit of the address signal A takes a value of "" 1 ", it is indicated that there is a recorded driver signal. Thus, when the Q output of the flip-flop 166 assumes a low level (value "0"), the moving contacts of the switching circuits 154 and 155 are connected to the terminals 154a and 155a, respectively. On the other hand, the moving contacts of the switching circuits 154 and 155 are connected to the terminals 154b and, 155b, respectively, when the Q output of the flip-flop 166 assumes a high level (value "1"). Thus, when the played second channel audio signal is obtained from the de-emphasis circuit 153, this played audio signal is passed through the switching circuit 154 and then fed to a noise suppression circuit 167 in which a known signal processing is performed to suppress the noise. An output from the noise suppression circuit 167 is obtained through an output terminal 168. On the other hand, when the modulated signal modulated by the driver signal is obtained from the de-emphasis circuit 153, this played modulated signal is passed through the switching circuit and output through an output terminal 169.

As shown in Fig. 17, the played modulated signal obtained from the output terminal 168 is supplied to the driver modulator 115 in the interface box 57 together with the played video signal obtained from the signal demodulator 110. The driver gram degree modulator 115 has a structure as shown in FIG.

20A and below will describe the structure of the driver modulator 115. In FIG.

20A, the reproduced modulated signal is applied to an input terminal 170 and then supplied to a decoder 171 in which the played modulated signal is demodulated to a played driver signal. The decoder 171 is also supplied with a played vertical synchronization signal and with a played horizontal synchronization signal. These played vertical and horizontal sync signals are separated in a sync signal separation circuit 173 from the played composite color video signal which is supplied to the sync signal separation circuit 173 through an input terminal 172.

The decoder 171 can be a microprocessor or a digital circuit. In case the decoder 171 consists of a microprocessor, the decoder 171 operates according to a flow chart drawn in Fig. 21. In other words, the existence of the vertical synchronization signal is detected in a step S1. When there is an incoming vertical synchronizing signal, the variables A, B, 30 and C are respectively cleared and the horizontal synchronizing signal is simultaneously counted in a step S2. Then, the scan line number 21H (284H) is detected in a step S3. The scan line number 21Ή (284H) is detected because the driver signal composed of a total of 35 15 bytes is captured from the scan line number 21H (284H), 8400275 - 36 - r as described above.

Then, a step S4 detects an incoming horizontal sync signal. A step S5 sets the variables C = B and B = A and sets the variable A to the value 5 ("0" or "1") of the data on the scan line number 21H (284H).

Then, a step S6 detects whether there is again an incoming horizontal sync signal. When there is again an incoming horizontal sync signal, step S7 sets the variables C = B and B = A and the variable A at 10 sets the value of the data on the scan line number 22H (285H).

The data in the played back control signal is a square wave which is obtained by forming the signal shown in Fig. 9 (D) into a square wave signal. The logic level "0" or "1" of the data in the played driver signal is in phase with the played horizontal synchronization signal. Three continuous sampling output signals obtained in accordance with the phase of the horizontal synchronization signal will not take the same value. When two continuous sample output signals 20 sampled with the horizontal scan time assume the same value, the logic level "0" is indicated. On the other hand, when these two continuous sample output signals assume different values, the logic level "1" is indicated. This should be clear from Figures 9 (A) 25 and 9 (D).

The decoder 171 distinguishes whether the values of the variables A, B and C are equal in a step S8.

When the values of the variables A, B and C are equal, a step S9 determines that there is an error. On the other hand, when the values of the variables A, B and C are not equal, a step S10 distinguishes whether the values of the variables A and B are the same. When the values of the variables A and B are the same, a step S11 detects that the data is "0". A step S12 detects that the data is "1" when the values of the variables A and B are not the same. Thereafter, an 8400275 operation corresponding to the operation described above is repeated until a step S13 detects the end of a block.

The decoder 171 performing the above-described operation may consist of a digital circuit as shown in Fig. 22. In Fig. 22, a modulated signal subjected to a self-clocking modulation by the driver signal played from the plate 55, supplied to an input terminal 190. This modulated signal is subjected to a signal shaping operation in a comparator 191 and is then applied to a data input terminal of a D-type flip-flop 192. The flip-flops 192, 193 and 194 are connected in series in three stages. The played horizontal sync signal is applied to an input terminal 195 and counted in a counter 197. The counter 197 is reset to zero in response to the played vertical sync signal applied to an input terminal 196, and outputs the scan line number 21H (284H). This output from counter 197 sets a flip-flop 198 and opens the gate of an AND circuit 199. In addition, flip-flop 198 is reset to zero in response to the vertical sync signal. Thus, the played horizontal sync signal is applied to clock terminals of the flip-flops 192 to 194 as a clock pulse from the time the scan line number 21H 25 (284H) is obtained, until the time the vertical sync signal is obtained. As a result, when the sample output signals take the same value for 3H, an error signal is supplied through an exclusive OR circuit 200, an NOR circuit 202 and an output terminal 203. When the sample output signals take the same value for 2H, a signal indicating that the data "0" is supplied through an exclusive OR circuit 201 and an output terminal 204. Furthermore, when the sample output signals assume different values for 2H, a signal 35 indicating that the data is "1" is supplied through the output 8400275 - 38 - terminal 204.

Returning to FIG. 20A, the played driver signal (data) obtained through the decoder 171 is an MRZ signal. This NRZ signal is sequentially fed to eight 14-bit shift registers 174-1 through 174-8 connected in series. On the other hand, the played vertical sync signal obtained from the sync signal isolation circuit 173 is output through an output terminal 175. The played horizontal synchronization signal obtained from the synchronization signal isolation circuit 173 is frequency divided by two in a frequency divider 176. An output signal whose frequency is divided into this frequency divider 176 is applied in parallel to the shift registers 174-1 through 174-8 as a pass-through clock signal. This output of the frequency divider 176 is also applied to an 8-bit shift register 177. The shift registers 174-1 through 174-8 form part of the circuit that performs an operation to rearrange the shuffled data in the ear-20. sequence which was described in connection with Figures 6a and 6B. 1-bit data B0 through B7 are respectively obtained from the shift registers 174-1 through 174-8 and were fed in parallel to an error-correcting ROM table 182. The data obtained from the shift register 174-8 which contains the last stage of the eight series-connected shift registers 174-1 through 174-8 are fed to the 8-bit shift register 177 in which the data is subjected to a series / parallel conversion. An output of this shift register 177 is connected to a comparator 179. The comparator 179 compares the data from the shift register 177 with a predetermined framing code pattern previously stored in a memory 180. When the two 8-bit signals in the comparator 179 coincide, it is detected that the framing codeword shown in Fig. 7 has been played and the comparator 179 provides a framing code word detection signal. This framing code word detection signal is supplied to a memory address generator 185 shown in FIG. 20 through an output terminal 181.

The error correcting ROM table 182 is used to detect and correct the error in the 8-bit data applied to it in known manner using the check bits b5 to b8 shown in Fig. 4 are signed. The 4-bit information data freed from 10 errors is supplied in parallel via terminals 183-1 through 183-4. When the error correction cannot be performed, an error detection data is provided through a terminal 184.

These output data from the error correcting ROM table 182 are supplied to a buffer memory and data selector 116 shown in FIG. 17 as the output data from the driver modulator 115. FIG. 20B is a systematic block diagram showing the construction of the buffer memory and data selector 116 in more detail. In Fig. 20B, the 20 parts which are the same as the corresponding parts in Figs. 17 and 20A are designated by the same reference numerals. In Fig. 20B, the data supplied through terminals 183-1 through 183-4 and 184 is supplied to a buffer memory 116a. On the other hand, the played vertical synchronizing signal, the signal obtained by frequency division of the horizontal scanning frequency f

H

2, the framing code word detection signal and a transfer request signal obtained from a terminal 123, respectively, are supplied to the memory address generator 185 via 30, the respective terminals 175, 178 and 181. When the framing code word detection signal is supplied to the memory address signal generator 185 via the terminal 181, the 4-bit data from terminals 183-a through 133-4 is valid. Thus, in this case, the memory address signal generator 185 supplies an address signal indicating an allocated address to 8400275 - 40 - the buffer memory 116a so that the 4-bit data is stored at the allocated address of the buffer memory 116a. The value of the address signal changes every H / 2. Furthermore, a status obtained from a player operation controller 5 122 in the video disc player 56, shown in Fig. 17, is obtained via a terminal 124, and a played address data (record address) of the address signals A,, A, and Ac, supplied from the signal demodulator 110 and obtained through a terminal 126, temporarily stored in the buffer memory 116a so that the status and the plate address can be transmitted at a predetermined transmission rate. For example, the status consists of 25 bits and indicates the content of the recorded information signal (ie the television system of the video signal, the type of audio signal and the like), the side of the record being played, the display mode , the position information of the playback needle, the playback mode, and the like.

The driver signal data, status and record address stored in the buffer memory 116a, 20 are respectively read from the buffer memory 116a and supplied to a data selector 116b. The data selector 116b selectively passes one type of data in accordance with a transmission request signal from a command analyzer 121 to be described below. The data selectively passed through the data selector 116b is passed through an RS232C driver 117 shown in Figures 17 and 20B. An output from the RS232C driver 117 is supplied to an input terminal 129 of the personal computer 62 shown in FIG. 18, through an output terminal 118. The command analyzer 121 produces a transmission request and supplies this transmission request to the data selector 116b so that the driver stored in the buffer memory 116a is sequentially fed to the personal computer 62 from the data selector 116b unless a command forbidding such operation becomes command 1400 analyzer 121 supplied.

As is well known, the RC232C interface is a standard decided by US. Electronics Industry Association (EIA) on the recommendation of the International 5 Consultative Commission for Telephony and Telegraphy (CCITT).

In the exemplary embodiment described here, the RS232C driver 117 and an RS232C receiver 120 form an RS232C interface circuit 205 shown in FIG. Of the 25 pins of this interface circuit 205, the following signals are presented to 10 or supplied from the second, third, fourth, fifth, sixth, seventh, eighth and twentieth pins represented by, O1 / »(S), @ # - and @. The played data, respectively an address information related to the internal state of the video record player 56, is supplied via the second pin and supplied to the external device 61. Furthermore, a control command regarding the video record player 56 is supplied to the third pin from the external device 61. The signals delivered from the fourth, fifth, sixth, 20. seventh, eighth and twentieth pins are originally intended for controlling the modem or determining the state of the modem. However, in the exemplary embodiment described here, the signals from the fourth pin and the fifth pin are used to control the processing of the transmission of the video record player 56 relative to the external device 61. A request for a broadcast from the video record player 56 to the external device 61, the video disc player 56 is done when the signal at the fourth pin takes a positive sign. When the external device 61 is in a state where it is possible to receive the broadcast, the sign of the signal from the fifth pin is made positive with respect to the video disc player 56. When these two conditions are met, a broadcast takes place from the video recorders-player 56 to the external device 61 using the second pin 84 0 0 2 7 5 - 42.

The signals from the sixth, eighth and twentieth pins are used to control the reception of signals from the video record player 56. When the video-5 record player 56 is in a state where reception is possible, the sign of the signal from the twentieth pen made positive. Furthermore, when the external device 61 is in a state where transmission is possible, the sign of the signals from the sixth and eighth pins is made positive. When these two conditions are met, a control command is sent to the video record player 56 from the external device 61 using the third pin.

The seventh pin is grounded.

The data received by an RS232C-15 receiver 130, shown in Fig. 18, located in the personal computer 62 used as an example of the external device 61, is supplied to a data selector 131. The signals supplied to the data selector 131 are supplemented with the 1-byte head signal, respectively.

Thus, the data selector 131 uses this header signal to distinguish the type of data entered and selectively feeds the input data to a predetermined memory, namely, a status memory 132, a driver memory 133, or a plate address memory 134 When the data is a status, it is supplied to the memory 132 and stored therein. When the data is a driver, it is supplied to the memory 133 and stored therein. Furthermore, when the memory is a record address, the data is supplied to the memory 134 and stored therein. A driver interpreter 135 is entered into the personal computer 62 as described above. The status stored in the memory 132, the driver stored in the memory 133 and the plate address stored in the memory 134 are respectively converted into a language appropriate to the personal computer and are further interpreted as commands such as 8400275 - 43 - feed orders, export orders and internal processing orders. Accordingly, signals are generated via an input / output (I / O) controller 139 to display a desired image on a cathode ray tube (CRT) 140 or to operate a printer 141 to give some examples.

In addition, I / O control 139 receives or stores signals from an external device, such as a diskette 142 and an interactive terminal (CMT) 143, as needed, in these external devices. When the incoming command 10 requests information from an input device, such as a keyboard 136, a control lever 137 or a drawing board 138, the user manipulates the input device according to the request, in response to such an operation by the user, the signals being supplied to 15 output devices, such as the CRT140 or the printer 141, controlled by the I / O controller 139. Furthermore, a command is generated that controls the record player and runs through a player control command converter 144, an RS232C driver 145 and an output terminal 146 This command 20 is supplied to the RS232C receiver 120 in the interface box 57, shown in Fig. 17, through an input terminal 119.

The command received by the RS232C receiver 120 is supplied to the command analyzer 121.

The command analyzer 121 performs the operations in accordance with the flow charts shown in Figures 24A, 24B, 24C and 24D, and outputs the player operation controller 122. In addition, the command analyzer 121 generates the broadcasting signal. request signal, and supplies this broadcast request signal to the driver derodulator 30 115 and to the buffer memory and data selector 116.

The operation of the command analyzer 121 will now be described. In Fig. 24A, a step S20 detects the file of an incoming command. When there is an incoming command, steps S21 through S24 distinguish, respectively, whether this incoming command is a broadcast request command, an output switching command, a search instruction command, and a speed change command. Handling returns to step S20 when the incoming command does not match any of these four commands. When the incoming command is determined to be a broadcast request command, steps S25 through S27 detect whether this broadcast request command is an address broadcast request, a status broadcast request, or a driver broadcast request. When the broadcast request command is one of these three requests, steps S28 through S30 generate the previously described broadcast request signal corresponding to the detected broadcast request command and execute its instructions. Thereafter, the handling returns to the step S20.

When the incoming command is an output switch command, a step 31 shown in Fig. 24B determines whether the signal to be switched is the video signal. When the video signal is to be switched, a step S32 distinguishes whether the signal is to be suppressed (muting). The processing returns to the step S20 after the instruction corresponding to the result found in the step S32 has been executed in a step S33 or S34. On the other hand, when the signal to be switched is not the video signal, step S31 determines that the audio signal 25 is to be switched. Steps S35 through S40 distinguish whether to output a signal suppression, whether to provide a multiplexed audio signal (A + B) of the first-channel and second-channel audio signals A and B and whether the first-channel audio signal A and the second -30 channel audio signal B are to be swapped, and perform constructions based on the results obtained.

The handling then returns to step S20. The instructions in steps S33, S34 and S38 through S40 are executed with respect to the player operation controller 122. The player operation controller 122 generates an output switching request signal __m__ 8400275 - 45 - in accordance with these instructions, and supplies this output switching request signal to the output control 112 so as to control the output control 112.

When the incoming command is a search instruction, the command analyzer 121 determines in steps S41 to S43 indicated in Fig. 24C whether this search instruction relates to a chapter, a duration or a track. If the search instruction does not match any of these three search topics, the check returns to step S20. On the other hand, when the search instruction command matches one of the three search topics, steps S44 through S46 control the player operation controller 122 to perform the associated search.

The handling then returns to step S20. The player operation control 122 accordingly generates a servo control request signal 1 and supplies this servo control request signal to the tracking servo system 111. The servo control request signal controls the rotation of the drive motor 79 so that the motor 79 rotates in a direction and at a speed of 20 corresponding to a difference between the played-back address signal of the type instructed and the target address signal set, performs the tracking control operation ON or OFF, etc. control 122 extracts only the address signal A from the output signal of the signal demodulator 110 in the case that the search subject is a chapter, only the address signal in the case of the search subject is a duration and only the address signal A ^ in case the search subject is the track.

Further, when the incoming command is a speed change command, the command analyzer 121 determines in a step S51, represented in Fig. 24D, whether the displacement speed of the signal pickup device 68 is zero (ie, the video disc player 56 is playing back. of a still image). When the video disc player 56 plays a still picture, a step S54 supplies an appropriate instruction signal to the player operation controller 122 and the processing returns to the step S2Q. However, when the video record player 56 is not in the still picture playback state, the 5 steps S52 through S60 distinguish whether the direction of movement of the signal recording device 68 is in the forward direction (e.g. towards the inner edge of the record) or in the opposite direction (towards the outer edge of the plate, for example) and instruct the direction in accordance with the distinguished result, and further distinguish the displacement speed of the signal pickup device 68 and instruct the speed in accordance with the distinguished result. The instructions in steps S54 through S56, S59, S60, etc., are performed with respect to the player operation controller 122. The player operation controller 122 consists of the microprocessor 101 shown in Fig. 16.

The driver signal recorded on the record 55 is played, and the commands of the played driver signal are supplied to the personal computer and then transmitted to the video player player 56 from the personal computer 62. It takes approximately the seven fields before the video disc player 56 actually performs the operations based on the commands transmitted thereto. For this reason, the control program signal is recorded at a location on the plate 55 prior to a predetermined location on the plate 55 where a predetermined action based on the program is to be performed. But further, when playing a program, the command or commands to be broadcast from the personal computer 62 to the video disc player 56 are previously broadcast to a buffer memory in the command analyzer 121 and stacked therein in sequence. The command analyzer 121 thus determines whether the played address information of the plate 55 coincides with the address 35 of the stacked job and supplies a control signal to the 8400275 - 47 player operation controller 122 when the played address information and the address of the stacked job coincide. Thus, the video disc player 56 can perform the predetermined operation according to the stacked command, 5 with an extremely short time delay counted from the time when the predetermined location on the record 55 is reached. In this case, a predetermined signal processing is performed within a field in which the played-back address information with a predetermined value is obtained, and the video disc player 56 can perform the operation based on the stacked command from the next field. The time delay is therefore only one field.

As described above, the video disc player 56 performs various operations by moving the playback needle 15 based on the control commands transmitted from the personal computer 62 to the video disc player 56. For example, the playback needle can be moved to a predetermined track position at a high speed for to perform a search operation. In addition, the video disc player 56 can perform still picture playback, or search for a program with a predetermined chapter number after performing normal playback for a specified time.

The recorded video and audio signals played from the record 55 in the video record player 56 are respectively supplied to the TV monitor 113 displaying the played back image, and to the speaker 114 generating the played back sound. At the same time, it is possible to play the recorded driver from the record 55. As a result, the commands can be sent in two directions between the record player 60 and the external device 61, and it is possible to perform an interactive playback.

For example, the information recorded on plate 55 may be related to a discussion of the Japanese industry, as indicated in Fig. 25. This discussion is composed of a summary 210 of the industry, a comment 211 on the heavy industry, a comment 212 on light industry, a comment 213 on the chemical industry and a comment 214 on the future. It will be assumed that the summary and the comments are all recorded in time order in 10,000 tracks each. In addition, it will be assumed that a driver signal allowing the user to select a search subject is registered from a position a with a track address "200" immediately preceding summary 210, and a position b with a track address "9700" where the registration of the summary 210 is terminated. Furthermore, it will be assumed that a driver signal that allows the user to select one of comments 211 to 213 and that it allows to locate the beginning of the selected comment is recorded from position b. It will further be assumed that a driver signal allowing the user to make a selection at positions f through h where the recording of the respective comments 211 through 213 is terminated is made in order to choose whether to revert to the position b, the comment 214 is played or transitions to a last position j where recording ends.

In this case, the driver played from the track address "200", which is in a medium level language, for example "IF / tNKEY $ =" N "THEN SEARCH 9700", is subject to the signal processing including the above described error correction and the like, and is then transmitted to the personal computer 62 via the RS232C driver 30. The personal computer 62 decodes the driver supplied thereto and detects the input from the keyboard 136. When the input from the keyboard 136 is the letter Is "N", the personal computer 62 generates a command "SEARCH 9700" which means that the track address 35 must be "9700". This command "SEARCH 9700" is supplied 8400275: .- 49 - to the interface box 57 via the RS232C driver 145. The command analyzer 121 decodes this command upon receipt and causes the player operation controller 122 to perform the search. In this state, the signals recorded on the plate 55 which are present from the position immediately following the position where the command is played, up to the position immediately preceding the track address "9700" will not be played. On the other hand, when the input from the keyboard 136 is the letter "N", the search-10 * operation is not performed. Normal playback continues accordingly up to a track address "9900".

Then, a driver "ON KEY SEARCH 10000, SEARCH 20000, SEARCH 30000" is played from the track address "9900". This driver allows one of the comments 211, 212 or 213 to be played at will.

When the input from the keyboard 136 is "1", the personal computer 62 issues a command "SEARCH 10000" to the interface box 57. Similarly, the personal computer 62 issues commands "SEARCH 20000" and "SEARCH 30000" the interface box 57 when the input from the keyboard 136 is "2" and "3", respectively. Thus, operations similar to the above-described operation are performed, then similar operations are again performed.

The invention is not limited to the exemplary embodiments described heretofore. For example, the invention can be applied to an optical type plate. The signals recorded on the optical type plate are played by detecting the variations in the strength of light reflected to or transmitted through the plate 30 by a beam of light falling on the plate. The invention can also be applied to a case where only one channel of the audio signal exists. In addition, the driver signal can be recorded independently with interrupts instead of the second channel audio signal. In addition, although an illustration thereof is omitted 8400275 - 50 - in Figure -8, a noise suppression circuit is present at the output side of both audio signal sources 27 and 28, and a pre-emphasis circuit is present at the output side of the switching chain 31.

Furthermore, the invention is not limited to these exemplary embodiments, but various variants and modifications can be effected without departing from the scope of the invention.

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Claims (11)

A driver signal demodulation device, characterized in that it includes: a driver demodulator (115) for obtaining a demodulated output of a driver signal from a signal played from a spinning recording medium, in the spinning recording medium at least the driver program signal is recorded together with a video signal, which driver signal indicates a driver that inputs and outputs commands and internal processing commands from an external device (61) connected to a player (56) playing the spinning recording medium, wherein the external device is a computer (62) or the like with a discriminating function; memory means (116a, 185) for at least temporarily storing the demodulated output from the driver modulator and providing the stored demodulated output; selectors (116b) for optionally supplying data received from the memory means in response to a transmission request; interface organs (117, 120) for transmitting the data supplied from the selectors to the external device, and for receiving one or more control commands from the external device; and a command analyzer (121) for decoding one or more control commands received from the interface means, and for generating a signal controlling the operation of the player or a signal requesting transmission with respect to the memory organs and the selectors. A driver signal demodulation device as defined in claim 1, characterized in that the driver signal demodulation device is formed integrally with the player (56) and forms a record player (60) together with the player; and in that the player comprises displays (68, 69, 88) reproducing recorded signals from the revolving recording medium by means of 8400275 JS-52 of a recording playback element (69), a band-limited modulated signal being recorded in the revolving recording medium. together with the video signal in a same track path of a special-shaped track or concentric tracks 5, in synchronism with the horizontal synchronizing signal in the video signal, the band-limited modulated signal being fixed in a state in which the band-limited modulated signal is multiplexed with an audio signal or otherwise independently recorded in place of the audio signal, further obtaining the band-limited modulated signal by subjecting the driver signal to a modulation based on a reference clock signal with a period that is an integer multiple of the horizontal scanning period of the video signal and by limiting the band from the modulated signal to the band of the audio signal; a signal demodulator (1 (10) for obtaining at least the video signal from the played signal received from the playback members, * and a controller (122) for controlling the playback track position of the recording playback element , controlling the switching of signals from the signal demodulator, and controlling the spinning of the spinning recording medium, all by using the output signal from the command analyzer. A driver signal demodulation device as defined in claim 1, characterized in that the driver program modulator comprises a decoder (171) for obtaining the demodulated output of the driver signal from the signal played from the spinning recording medium, and means (174-1 to 174-8) for returning a transmission sequence of decoder output data to an original sequence and performing an error detection and an error correction with respect to the decoder output data. A driver signal demodulation device as defined in claim 2, characterized in that the 8400275-53 driver modulator demodulates the band-limited modulated signal which is separated from the played signal from the playback means using the horizontal sync signal in the played signal, and obtains the 5 demodulated output of the driver signal. A driver modulation device as defined in claim 1, characterized in that the interface members make an RS232C interface connection to the external device which is operated by means of an interpreter, monitor or an internal operating system (operating system). . 6. A pilot signal demodulation device as defined in claim 1, characterized in that the memory means temporarily stores an address signal that is discriminated and separated from the signal played from the rotary recording medium and designates a track position information, as well as a status indicating at least the operating state of the player playing the rotary recording medium, and the recorded information content of the rotary recording medium, and producing the stored address signal and the stored status; and that the selectors optionally provide the output of the demodulation device read from the memory means, the address signal or the status in response to the transmission request. A driver signal demodulation device as defined in claim 1, characterized in that the demodulation means demodulate the driver signal played from the spinning recording medium, in terms of blocks of fixed length close to a field. A driver signal demodulation device as defined in claim 1, characterized in that the driver is written in a mid-level language that conforms to a predetermined format and is essentially written in direct statements, and that the format of the 35 medium level language differs from the classification of a language originally 8400275 <5 - 54 - with regard to the external device that has the discriminatory function. A driver signal demodulation device as defined in claim 1, characterized in that the command analyzer contains a memory for sequentially storing the control command sent in advance based on the driver received in the external device that is has the discriminating function, and supplies the player with a signal controlling the operation of the player based on the control command when the value of an address signal reproduced from the rotating recording medium coincides with the address of the control command . A driver signal demodulation device as defined in claim 1, characterized in that the driver modulator is supplied with a modulated signal in the signal played from the spinning recording medium, and the modulated signal is obtained by subjecting the driver signal. is applied to a modulation and to the driver modulator without passing the modulated signal through a noise suppression circuit. A driver signal demodulation device as defined in claim 1, characterized in that the driver modulator distinguishes a discriminating signal and separates it from the signal played from the revolving recording medium, the discriminating signal containing information about the existence of a recorded driver signal on the rotating recording medium, and that the driver modulator substantially demodulates a modulated sig-30 sew obtained by subjecting the driver signal to a modulation only in the case where it is deduced from the discriminating signal that a recorded driver signal is present on the revolving recording medium. 8400275